Because they are carved out
well it shows scientists that there are more spots on the ISS
Europa is orbiting Jupiter in a region in between Ganymede and Io. This gravitational 'tug-of-war' between the two satellites creates friction, which creates heat under the ice surface which could mean there is liquid water under the ice.
because the igneous rock comes from below earth's surface
How far north or south of the equator the location lies.
sonar - by bouncing sound signals off the bottom of the ocean, they were able to map the depth of the ocean. Deep sea diving would take too long. Satellites were not in orbit until the 1970's and submarines were not necessary since sonar could be done from the surface on a boat.
Science news(including satellites) could be found in sciencedaily.com, sciencenews.org, or nytimes.com.
yes
There are no land features on Jupiter as there is no solid surface. The closest thing you could get is a cloudscape. We do no know what this looks like as no pictures have ever been taken from within Jupiter's atmosphere.
Because there could be weapons of mass destruction aboard it + they can use the satellites for surveillance.
You could send out probes, and satellites.
Old satellites that are in orbit and still powered continue to perform their function. Old satellites that have no power and are still in orbit have no use. Those that fall from orbit have no use as the are destroyed on reentry. Old satellites that have never been launched could be used as museum exhibits.
Neptune. There is a "Great Dark spot" on Neptune in which you could fit two Earths! However this enormous storm seems to surface and then vanish without warning. This has baffled scientists. Not to mention that the wind speed on Neptune is tremendous.